Cheap Flights from San Francisco (SFO) to Sion (SIR)

Popular airlines from San Francisco Intl. Airport (SFO) to Sion (SIR)

Frequently asked questions

How much does a flight from San Francisco Intl. Airport (SFO) to Sion Airport (SIR) cost?
Get a cheap one-way flight or cheap return flight from San Francisco Intl. Airport (SFO) to Sion Airport (SIR) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from San Francisco Intl. Airport (SFO) to Sion Airport (SIR)?
Planning your trip for is a great way to save, as it's the cheapest month for flights between SFO and SIR. You'll typically find the lowest fares during the off-season.
What is the cheapest airline that flies from San Francisco Intl. Airport (SFO) to Sion Airport (SIR)?
Expedia's filter tool lets you easily compare travel time, airlines and fares all in one place. Customize the search to your preferences, then sort by "Price (lowest to highest)" to find out which carrier offers the cheapest SFO to SIR flight.
How many flights per day from San Francisco Intl. Airport (SFO) to Sion Airport (SIR)?
Nonstop flights from San Francisco Intl. Airport (SFO) to Sion Airport (SIR) aren't available daily, so you'll need to take a flight with a layover. Explore your options with our filter tool. Enter your travel details and choose either "1 Stop" or "2+ Stops."
What day of the week has the most flights from SFO to SIR?
Friday is generally the busiest day for flights, while Tuesday is often the quietest.* Keep in mind that flight schedules can vary depending on a range of factors, such as the carrier and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from San Francisco Intl. Airport (SFO) to Sion Airport (SIR)?
Book a flight from San Francisco Intl. Airport (SFO) to Sion Airport (SIR) that leaves before 3 PM to reduce the risk of delays and cancellations. Later departures have a 22% higher chance of being canceled, on average.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from San Francisco Intl. Airport (SFO) to Sion Airport (SIR) last-minute?
Last-minute bookings from SFO to SIR are usually more expensive. To lock in the lowest prices, start looking for flights well ahead of time. That being said, if your travel plans are flexible, you may score a cheap fare right before your trip.
Is it cheaper to book a SFO to SIR flight and hotel package?
Booking a SFO to SIR flight and hotel package is generally cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels in one place. Select from our extensive range of stays and then add car rentals, flights and activities to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from San Francisco Intl. Airport (SFO) to Sion Airport (SIR)?
Typically, it's possible to cancel or reschedule your SFO to SIR flight. However, if it's been more than 24 hours since booking, additional fees may apply. Check your airline's policies in your itinerary to see what changes are possible and whether any costs are involved. You'll also find more information on our Customer Service portal.

Travel information

Origin airport
San Francisco Intl.
Destination airport
Sion
Distance
5859 mi

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San Francisco to Sion Flights

The cheapest times to fly from San Francisco to Sion

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from San Francisco to Sion are during the month of . You can find some of the cheapest flights from San Francisco to Sion with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from San Francisco to Sion

Sunday is one of the best days to book for cheap flights from San Francisco to Sion: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from San Francisco to Sion

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from San Francisco to Sion in 2025. You can also book with separate airlines for your outbound and return journeys, from one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap San Francisco to Sion flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your San Francisco to Sion airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

San Francisco to Sion Flights

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*Available to One Key members.